BAC One-Eleven

The British Aircraft Corporation One-Eleven, also known as the BAC-111 or BAC 1-11, was a British short-range jet airliner of the 1960s and 1970s. It was the second short-haul jet airliner to enter service, following the French Sud Aviation Caravelle. The aircraft was also produced under license in Romania during the 1980s as the Rombac One-Eleven.

The One-Eleven was originally conceived by Hunting Aircraft and was subsequently developed by the British Aircraft Corporation when Hunting merged into BAC along with several other British aircraft manufacturers in 1960. The One-Eleven was intended to replace the earlier turboprop-powered Vickers Viscount on short-range routes. The One-Eleven made it to market ahead of rivals such as the McDonnell Douglas DC-9, which gave it a temporary edge on the market.

The aircraft proved to be popular with domestic airlines and with various international operators; over half of the One-Eleven's sales at launch were to the largest and most lucrative market, the United States. The One-Eleven was one of the most successful British airliner designs and served until a widespread retirement in the 1990s, which was partly due to the introduction of aircraft noise restrictions in many European nations.